65815250000 has 140 divisors (see below), whose sum is σ = 163307362764. Its totient is φ = 25680000000.

The previous prime is 65815249993. The next prime is 65815250021. The reversal of 65815250000 is 5251856.

It can be written as a sum of positive squares in 14 ways, for example, as 30412569664 + 35402680336 = 174392^2 + 188156^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 10246790 + ... + 10253210.

Almost surely, 2^65815250000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65815250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81653681382).

65815250000 is an abundant number, since it is smaller than the sum of its proper divisors (97492112764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65815250000 is an frugal number, since it uses more digits than its factorization.

65815250000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6500 (or 6469 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 65815250000 in words is "sixty-five billion, eight hundred fifteen million, two hundred fifty thousand".